That was my point. As usual, you overthought it.
But I'm certain, just as TDKR was designed to entertain it's audience, not to be used as a tool for a psycho's agenda, when they designed the AR-15, the engineers and fabricators weren't doing so, so that some ********* would use the rifle to go into a theatre and unload on an innocent audience. That's where your flaw comes in.
Nice try but that answer fails the "direct, not-convoluted" requirement.
The purpose of a Batman movie is to entertain.
The purpose of an AR-15 is to kill.
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Now if I wanted to do what you just did, I could come up with a convoluted --but still plausible-- purpose for each--
The purpose of a Batman movie is to entertain...ONLY those who have the best intentions, will pay full ticket/dvd/blu-ray/netflix price and not pirate it, and only those who are all around good people.
The purpose of an AR-15 is to kill...but ONLY when used by law enforcement against lethal criminals, or the US military and our allies against our enemies on the fields of combat.
Sure, both of these explanations assume the very best (or at least, "ridiculously specific" intentions) of their respective creators...but you can't deny that when you get
that specific with it....they are at best---assumptions.
The pure and simple purpose of a
lethal gun as a thing...is to
be lethal. Some will apply the same thing to cars or butcher knives or medicine in the wrong hands---all of these things CAN be lethal too...but if they are, they failed at their primary purpose (to get someone from A to B, to cut a steak, to help a sick person).
Killing is not some "secondary" function of an AR-15. It's not something that it only "might" be capable of in an accident situation like those other things.
Killing (and killing rapidly and efficiently) is it's primary and intended function.